from flask import abort, jsonify
from flask import current_app
from flask import g
from flask import render_template
from flask import request
from flask import session

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route('/comment_like', methods=["POST"])
@user_login_data
def set_comment_like():
    """评论点赞"""

    if not g.user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 获取参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    # 判断参数
    if not all([comment_id, news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e :
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")


    # 查询评论数据
    try:
        comment= Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询数据失败")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论数据不存在")

    if action == "add":
        # 点赞评论
        comment_like = CommentLike.query.filter_by(comment_id=comment_id, user_id=g.user.id).first()
        if not comment_like:
            comment_like = CommentLike()
            comment_like.comment_id = comment_id
            comment_like.user_id = g.user.id
            db.session.add(comment_like)
            # 增加点赞条数
            comment.like_count += 1
    else:
        # 删除点赞数据
        comment_like = CommentLike.query.filter_by(comment_id=comment_id, user_id=g.user.id).first()
        if comment_like:
            db.session.delete(comment_like)
            # 减小点赞条数
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="操作失败")
    return jsonify(errno=RET.OK, errmsg="操作成功")





@news_blu.route('/news_comment', methods=["POST"])
@user_login_data
def comment_news():
    """
    评论新闻　或者　回复某条新闻下指定的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 获取参数

    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)

    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询数据失败")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="该新闻不存在")

        #３ 初始化模型，保存数据
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 保存到数据库

    #　为什么要自己去commit()?　因为在return　的时候　需要用到comment　的id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="保存评论数据失败")

    # 返回响应
    return jsonify(errno=RET.OK, errmsg="评论成功", data=comment.to_dict())











@news_blu.route("/news_collect", methods=['POST'])
@user_login_data
def news_collect():
    """
    收藏新闻
    １．　接受参数
    ２．判断参数
     3.查询新闻，并判断新闻是否存在
    :return:
    """

    user = g.user

    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # １．　接受参数
    news_id =request.json.get("news_id")
    action =request.json.get("action ")


    # 2.判断参数
    if not all([action,news_id ]) :
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ("collect", "cancel_collect"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
    except Exception as e :
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3.查询新闻，并判断新闻是否存在

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询数据失败")

    if not news:
        return jsonify(errno=RET.NODATA, errmsg="新闻数据不存在")

    # 4.收藏 及　取消收藏
    if action == "cancel_collect":
        # 　取消新闻收藏列表
        if news in user.collection_news:

            user.collection_news.remove(news)
    else:
        # 　添加到用户的新闻收藏列表
        if news not in user.collection_news:

            user.collection_news.append(news)



    return jsonify(errno=RET.OK, errmsg="操作成功")






@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
    新闻详情
    :param news_id:
    :return:
    """

    user = g.user

    # 右侧的新闻排行的逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    # 定义一个空的字典列表　　里面装的是字典
    news_dict_li = []
    # 　便利对象列表，将对象的字典添加到字典列表中
    for news in news_list if news_list else []:
        news_dict_li.append(news.to_basic_dict())

    news = None
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)


    if not news:
        # 返回数据未找到的页面
        abort(404)

    news.clicks += 1

    # 判断是否收藏该新闻，默认值为 false
    is_collected = False
    # 判断用户是否收藏过该新闻
    if user:
        if news in user.collection_news:
            is_collected = True



        # 获取当前新闻的评论
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)



    comment_like_ids = []
    if g.user:
        # 如果当前用户已登录
        try:
            comment_ids = [comment.id for comment in comments]
            if len(comment_ids) > 0:
                # 取到当前用户在当前新闻的所有评论点赞的记录
                comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                         CommentLike.user_id == g.user.id).all()
                # 取出记录中所有的评论id
                comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)




    comment_dict_li = []

    for comment in comments:
        comment_dict = comment.to_dict()
        comment_dict["is_like"] = False
        if comment.id in comment_like_ids:
            comment_dict["is_like" ] = True
        comment_dict_li.append(comment_dict)




    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news":news.to_dict(),
        "is_collected":is_collected,
        "comments":comment_dict_li

    }
    return render_template('news/detail.html' ,data = data )